The former monastery was built on ruins of what was the first signs of human activity in Oaxaca area. A real piece of history.
Wikipedia (Spanish) http://es.wikipedia.org/wiki/Exconvento_de_San_Pablo_%28Oaxaca%29
Address 495 Avenida Miguel Hidalgo, Oaxaca de Juárez 68000, Mexico
Coordinates 17°3'38.862" N -96°43'24.233" E